Gate valve



FIG. 1 is a perspective view taken from the top, front and left side of a gate valve showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a gate valve, as shown. 